The invention relates to a preparation method of a pure-
biomass leather cleaner and belongs to the technical field of leather cleaners. The preparation method comprises the steps that firstly,
fresh milk is fermented to obtain raw yogurt, then
tannin rich liquid is extracted from banana peels,
egg white and washing water of rice are mixed, finally, the three substances are mixed and fermented, a natural
preservative component is added, and the leather cleaner is obtained after concentration. According to the preparation method,
lactic acid in the raw yogurt serves as a natural decontaminant, crude fibers in the washing water of rice serve as a friction agent to remove stains in leather, after cleaning is finished,
tannin in the
banana peel extracts and proteins in the leather are combined, hide which is compact, tough and not prone to decaying is formed on the surface of the leather, finally, the yogurt as well as proteins and lipid contained in the
egg white can serve as a substitute of paraffin, a protective film is formed on the surface of the leather, the gloss of the leather can be maintained easily, no undesirable
odor is generated, safety and environmental friendliness are achieved, and the preparation method has broad application prospects.